Samco Engineers design a method
(GFAL) and instrument (GFAL-A, GFAL-B)
The GFAL-A/B instrument
has been used for many years in stations,
GFAL-B (tracking unit)
Does not require system interruption
Traditional methods of indicating DC ground faults are ineffective when
two or more faults are in opposite polarities of the DC multi-feeder
Samco engineering has created a new method that quickly will identify these faults on each polarity.
However once a fault has been identified, the fault must be located in order to be corrected.
Locating a DC ground fault is currently done in two ways. The
first method consists of opening circuit breakers or disconnecting
and interrupting the system until the fault is cleared, a procedure that is time consuming inaccurate and costly, since it requires shutting down the system..
The second method to locate DC ground fault injects an AC signal with
respect to ground into the DC system. This process can
damage sensitive electronic equipment or cause expensive nuisance trips.
THE GFAL EXPLAINED
The GFAL-A (interrupter) and GFAL-B (receiver) are battery
operated portable instruments that utilizes a
DC tracking signal create by the
interrupter and the fault resistance.
A Hall Effect magnetic Sensor Assembly is attach to the GFAL-B that wrap around the conductors to track the tracking signal.
There are three mayor components that make the GFAL-A/B instrument.
|| Item 1) The
interrupter unit GFAL-A creates a DC interrupted tracking
utilizing the fault resistance.
Item 2) The hand held unit GFAL-B
house the microprocessor and the
Item 3) The magnetic sensor
assembly (MSA) detect the magnetic field
Below is a partial list of users that have benefited from the innovative method implemented by the GFAL-A/B
Plant Bowen 3,540 MW (GA)
Plant Scherer 3,564 MW (GA)
Ray Olinger Plant 420 MW (TX)
City of Anaheim (250 KV) Substation (CA)
El Segundo GS 684 MW (CA)
Exxon Mobil Refinery (CA)
Callaway Nuclear Plant (MO)
Comanche Peak Nuclear Plant (TX)
Wolf Creek Nuclear Plant (KS)
Brunswick Nuclear Plant (NC)
Diablo Canyon Nuclear Plant (CA)
Palo Verde Nuclear Plant (AZ)
Hatch Nuclear Plant (GA)
Vogtle Nuclear Plant (GA)
Three Mile Island Nuclear Plant (PA
Bonneville Power Administration, Gov (OR)
Arnold Airforce Base, Gov (TN)
Paradise Power Plant,TVA Gov (KY)
Minimum specification of the GFAL-B
............................................3mA, will locate up to
40,000 Ohms fault in a 130VDC distribution system.
| If you need more information,
please contact us at:
Fountain Valley, CA 92708
Phone: (714) - 235 - 5901
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